Abstract:
:We report monozygotic twin girls with syndromic intellectual disability who underwent exome sequencing but with negative pathogenic variants. To search for variants that are unrecognized by exome sequencing, high-fidelity long-read genome sequencing (HiFi LR-GS) was applied. A 12-kb copy-neutral inversion was precisely identified by HiFi LR-GS after trio-based variant filtering. This inversion directly disrupted two genes, CPNE9 and BRPF1, the latter of which attracted our attention because pathogenic BRPF1 variants have been identified in autosomal dominant intellectual developmental disorder with dysmorphic facies and ptosis (IDDDFP), which later turned out to be clinically found in the twins. Trio-based HiFi LR-GS together with haplotype phasing revealed that the 12-kb inversion occurred de novo on the maternally transmitted chromosome. This study clearly indicates that submicroscopic copy-neutral inversions are important but often uncharacterized culprits in monogenic disorders and that long-read sequencing is highly advantageous for detecting such inversions involved in genetic diseases.
journal_name
Genomicsjournal_title
Genomicsauthors
Mizuguchi T,Okamoto N,Yanagihara K,Miyatake S,Uchiyama Y,Tsuchida N,Hamanaka K,Fujita A,Miyake N,Matsumoto Ndoi
10.1016/j.ygeno.2020.10.038subject
Has Abstractpub_date
2020-11-04 00:00:00eissn
0888-7543issn
1089-8646pii
S0888-7543(20)31997-2pub_type
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